Attachment for engravers&#39; blocks.



G. M.'BOWMAN.

ATTACHMENT FOR ENGRAVERS BLOCKS.

APPLICATION FILED SEPT. 23, 1909.

1,01 1,108. Patented 1190.5, 1911.

2 SHEETBSHEET 1. 2.4

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Fl E ATTORNEY COLUMBIA PIV-ANOUIAPH C0" WASHIW. D- C- C. M. BOWMAN.

ATTACHMENT FOR ENGRAVERS BLOCKS.

APPLIUATION FILED SEPT. 23, 1909.

2 SHEETS-BHEET 2.

1,01 1,108. Patented Dec.5, 1911.

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ATTACHMENT FOR ENGRAVERS BLOCKS.

Specification of Letters Patent.

Patented Dec. 5, 1911.

Application filed September 23, 1909. Serial No. 519,185.

To all whom it may concern:

Be it known that I, CHRISTIAN M. Bow- MAN, a citizen of the UnitedStates, residing at Lancaster. in the county of Lancaster and State ofPennsylvania, have invented certain new and useful Improvements inAttachments for Engravers Blocks, of which the following is aspecification, reference being had therein to the accompanying drawing.

My said invention relates to an attachment comprising work-holdingclamps for use in connection with an engravers block, the object beingto enlarge the capacity of the block whereby it is adapted to hold notonly a large variety of work of varying sizes, but also work of a muchlarger size than the block is adapted to hold without said attachment.

Said invention consists in providing a set of extension plates adaptedto be detachably secured to the extensible jaws of the engravers blockand formed to receive and carry various work-holding clamps and devicesin the same manner as the extensible jaws are also adapted to receiveand carry them.

Another object of the invention is to produce a set of work-holdingattachments which will be compact, and which will combine in a fewparts, clamps for holding a great variety of work, thus doing away withmany of the separate clamping devices now in use.

Still another object of the invention is to provide a set of attachmentsof this class that may be used in connection with any standard make ofengravers block and which may be quickly attached or detached therefromwithout the use of tools.

\Vith these and other objects in view my invention consists in certainconstruction and combination of parts as will hereinafter be fullydescribed and claimed, and illustrated in the accompanying drawings,which form a part of this application, and in which like figures ofreference refer to corresponding parts in all of the views; but it isfully understood that while I have described my invention as herewithshown, that I do not confine myself to the exact design as shown, asslight changes may be made in the construction and combination of theseveral parts without departing from the spirit of the invention.

In the drawings :-Figure l, is a side elevation of the device as appliedto a block,

the jaws of the block being shown in sec tion. Fig. 2, is a top planview of the same. Fig. 3, is a side elevation of one of the ad justablework-holding cubes, showing the grooved face which is adapted forholding such articles as bangles, etc. Fig. 4, is a view of another faceof the cube as adapted for holding rings, etc. Fig. 5, shows therevolving plate which is secured to one face of the cube in a positionfor holding watch cases and spoons. Fig. 6, shows still another positionof said plate. Fig. 7, is a side elevation of a modified form of thedevice, showing a different method of attaching to the block. Fig. 8, isa top plan view of the same. Figs. 9, 10, and 11, show a removablework'holding stud, which may be used in connection with the extensionclamps, as shown in Figs. 7, and 8, or which may be used upon the topsof the cubes.

Referring to the drawings, 1, indicates a portion of the head or frameof a standard engravers block, which is provided with the usual movablejaws 2, and operating screw 3; while the surfaces of said jaws areprovided with the usual holes 4, for the reception of the work-holdingpins. Said operating screw 3 is threaded in opposite directions at itsopposite ends as indicated in Fig. 2, each end engaging with ascrew-threaded part on a jaw 2, as is usual, whereby said jaws may beslid on said head toward and from each other in the ordinary manner.

The extension clamps or plates 5, are here shown as rectangular in formand formed with the vertical holes 6, in the body thereof, which arespaced each way equal distances apart. Said holes 6 are adapted toreceive the depending shanks or pins 13 and 27 of the respectivework-holding blocks, or clamps, l2 and 26, and other similar workholdingclamps, in the same manner that said pins or shanks are inserted in theholes 4 of the jaws 2 when the extension plates are not used.

For detachably retaining the extension plates 5, on the jaws 2, saidplates are provided, near their inner ends, with the depending studs 7,which are designed to enter the corresponding holes 4, in the jaws 2,thus retaining them in place, as shown in Fig. 1, or the extensions 5,may be provided with a hooked lug 8, which is adapted to be engaged by aslot 9, milled in the edge of the jaws 2, and further retained in placeby a snap-hook 10, which is mounted upon the lower surface of theextensions 5, and engages an orifice 11, in the edge of the jaws 2, asshown in Fig. 7.

For holding the work, I provide in addition to the usual clampingdevices 26 and other ordinary forms of clamps in common use, thecombination cubes or blocks 12, which are formed with the pins or studs13, depending from their under surfaces and which register with and areadapted to be inserted into the holes 6, and may be thus retained in anadjustable manner upon the jaws 2 or extensions 5, and with any pair oftheir corresponding faces adjacent to each other. The side faces of saidcubes 12, comprise, first, a vertical curved face 14, having ahorizontal curved groove 15, near the upper end thereof, which isadaptable to a large class of work. A second face is formed with avertical cylindrical orifice 16, extending to within a short distance ofthe top; while the edge of the top is provided with a notch 17, and theoverhanging top portion is pierced by a number of holes 18. The thirdface is formed with a vertical V- shaped groove 19, and a semi-sphericalorifice 20. The remaining face of the cube 12, is provided with anadjustable plate 21, which is retained thereon in any desired position,by the screw 22. Said plate, near one end thereof, is formed with acup-shaped groove 23, and at the other end with a projecting ear 24,grooved upon its face and provided upon its back with a spring 25, forengaging the upper surface of the cube and helping to retain the platein a vertical position.

It is useless to go into a detailed description of the uses to which thedifferent faces of the cubes may be put, as the combinations which maybe made are many for holding irregular shaped articles, as this will befully understood by the engravers, but it may here be stated that by theuse of my novel form of. cube, devices for holding all kinds ofarticles, are here contained in one loose pi'e'ce, where heretofore ithas required a separate piece for each article.

Having thus described my invention what I claim as new and desire tosecure by Let ters Patent is 1. An engravers block comprising a head,extensible jaws formed to carry detachable work holding devices,supports for said jaws, means for sliding said jaws toward and from eachother, and detachable extension plates mounted on said extensible jawsand projecting horizontally beyond the horizontal faces thereof, andalso formed to receive and carry work-holding devices interchangeablywith said jaws, substantially as set forth.

2. The combination in an engravers block of extensible jaws formed toreceive and support workholding devices, supports therefor, means forsliding said jaws in said supports, and extension plates mounted on saidjaws by inter engaging lugs and sockets and also formed to receiveandsu'pport separate work-holding devices by sin1ilar engaging means,substantially as set forth.

3. An engravers block comprising a head, supports, extensible jawsformed to receive and support work-ho ding devices, extension platessecured on said jaws, the plates and jaws having corresponding sockets,and work holding-devices detachably mounted on said extension plates,said plates and holding devices having studs whereby these parts may beinterchangeably mounted on the primary extensible jaws, substantially asset forth.

4. The combination with an engravers block having supports andclamp-carrying jaws thereon, of extension plates detachably secured onsaid jaws by means of inter-locking studs and sockets, and work holdingdevices on said extension lates, said holding devices being formed wit anumber of faces and a reversible clamping member secured on one of saidfaces of each holder adapted to clamp one style of work when in oneposition and another style of work when reversed, substantially as setforth.

In testimony whereof I afiix my signature in presence of two witnesses.

CHRISTIAN M. BOWMAN.

Witnesses:

MABEL L. LEFEVRE, JOHN J. THOMPSON.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. C.

